Hello TanjaB,
Thank you for reaching out to Constant Contact API Developer Support. My team is here to assist outside software developers with questions about building into Constant Contact's API.
Please send our team an email at webservices@constantcontact.com referencing case #32310931 with the username of the user that is trying to connect, as well as the API key or name of the integration so that we can take a look at our logs to try and find out what is causing the expired token error.
Please have a look and let us know if you have any other questions!
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